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  • fujiisoup · 2 ✖

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  • .sel does not keep selected coordinate value in case with MultiIndex · 2 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
301353831 https://github.com/pydata/xarray/issues/1408#issuecomment-301353831 https://api.github.com/repos/pydata/xarray/issues/1408 MDEyOklzc3VlQ29tbWVudDMwMTM1MzgzMQ== fujiisoup 6815844 2017-05-15T01:10:25Z 2017-05-15T01:10:25Z MEMBER

@benbovy Thanks for the comment.

Actually, I expected the following behavior python In [1]: ds.sel(x=2) Out[1]: <xarray.Dataset> Dimensions: (y: 2) Coordinates: * y (y) object 'a' 'b' x int64 2 Data variables: foo (y) int64 2 5 where the selected x is automatically converted to a scalar coordinate.

And also for the second issue, I expected something like python In [2]: ds.isel(yx=0) Out[2]: <xarray.Dataset> Dimensions: () Coordinates: y <U1 'a' x int64 1 Data variables: foo int64 1 both x and y become scalar coordinates.

Back to the first issue, I personally prefer to the automatic renaming because it enables the following chain methods, python ds.sel(x=2).isel(y=1) that might be intuitive especially for the hierarchic dimension structure.

 
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   .sel does not keep selected coordinate value in case with MultiIndex 228295383
301303055 https://github.com/pydata/xarray/issues/1408#issuecomment-301303055 https://api.github.com/repos/pydata/xarray/issues/1408 MDEyOklzc3VlQ29tbWVudDMwMTMwMzA1NQ== fujiisoup 6815844 2017-05-14T10:19:15Z 2017-05-14T10:19:15Z MEMBER

@shoyer Thanks for the information. (Sorry for my inaccurate ipython output)

Another related issue is

python In[3]: ds.isel(yx=1) Out[3]: <xarray.Dataset> Dimensions: () Coordinates: yx object ('a', 1) Data variables: foo int64 1 where MultiIndex structure is totally gone. (ds.isel(yx=[0, 1]) works perfectly.)

I am now looking into the code. Do you guys have any idea to fix them? I am thinking to modify Index.remap_label_indexers so that it also returns selected_dims containing names of dims that should be converted to scalar coordinates.

 
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   .sel does not keep selected coordinate value in case with MultiIndex 228295383

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